So while cyber security spending has grown at a fairly modest 4.7% year on year, Gartner is projecting stellar growth of 50% in Cloud Security, and still a quite reasonable growth in mobile security. With these sort of growth numbers we should see a fairly good environment for both investment and exits.

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Worldwide spending on information security will reach $75 billion for 2015, an increase of 4.7​%​ over 2014, according to the latest forecast from Gartner, Inc.
The global cybersecurity market is expected to be worth $170 billion by 2020, according to Hemanshu “Hemu” Nigam, founder of security advisory firm SSP Blue, and an expert in online safety and privacy who has led security efforts at Microsoft and News Corporation.
The cyber security market is estimated to grow at a compound annual growth rate (CAGR) of 9.8​% from 2015 to 2020, according to a report from Markets and Markets.
HOT GROWTH SECTORS
According to IDC, the hot areas for growth are security analytics / SIEM (10​%​); threat intelligence (10​% +); mobile security (18​%)​; and cloud security (50​%​).